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The influence of landscape structure on butterfly diversity and movement in grasslands

a comparison of two agricultural areas in southern Sweden

Schneider, Christine (2003). The influence of landscape structure on butterfly diversity and movement in grasslands. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 386
ISBN 91-576-6432-3
[Doctoral thesis]

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Abstract

The objective of this thesis was to investigate the influence of habitat and landscape factors on butterfly diversity and movement in grasslands. The studies were carried out in two agricultural areas in Southern Sweden that differed in landscape structure, including habitat amount and field size. The results show that both habitat characteristics and landscape structure influenced species numbers and abundance of butterflies in grasslands. The amount of adjacent forest, flower abundance, field size and estimated nutrient levels were factors identified as influencing butterfly species composition. Mark-release-recapture experiments with two grassland butterflies (meadow brown, Maniola jurtina L. and scarce copper, Lycaena virgaureae L.) indicated that these species regularly move over distances of several hundred metres in a landscape with a high amount of habitat. The differences in movement pattern between the two species were greater in terms of movement frequency than total distances. A comparison with results of published mark-release-recapture data for the two studied species and other butterflies, made evident the dominant impact of the size of the study area on mean movement distances. A comparison of the movement patterns of the same species (Maniola jurtina) in the two different study areas showed that dispersal differed between the two areas. Dispersal rates were much lower in the study area with a low amount of habitat. The factors influencing patch immigration differed between the two study areas. The dispersal functions fitting proportions of individuals that moved were also different, which can be important in the context of modelling movement. In marginal agricultural areas, abandonment is the greatest threat to semi-natural grasslands. Different degrees and patterns of abandonment were estimated to affect butterfly diversity and movement quite differently. This emphasises the importance of spatial planning for landscape change in agricultural areas in order to minimize negative impacts on species diversity.

Authors/Creators:Schneider, Christine
Title:The influence of landscape structure on butterfly diversity and movement in grasslands
Subtitle:a comparison of two agricultural areas in southern Sweden
Year of publishing :April 2003
Volume:386
Number of Pages:51
Papers/manuscripts:
NumberReferences
ALLI. Schneider, C. & Fry, G.L.A. 2001. The influence of landscape grain size on butterfly diversity in grasslands. Journal of Insect Conservation 5, 163-171. II. Schneider, C., Dover, J. & Fry, G.L.A. 2003. Movement of two grassland butterflies in the same habitat network: the role of adult resources and size of the study area. Ecological Entomology 28, 219-227. III. Schneider, C. 2003. The influence of spatial scale on quantifying insect dispersal: an analysis of butterfly data. Ecological Entomology 28, 252-256. IV. Schneider, C. & Fry, G.L.A. Dispersal of the Meadow Brown butterfly Maniola jurtina in two different habitat networks. (Submitted manuscript). V. Schneider, C. & Fry, G.L.A. Estimating the consequences of land-use changes on butterfly diversity in a marginal agricultural landscape. (Manuscript).
Place of Publication:Alnarp
ISBN for printed version:91-576-6432-3
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P01 Nature conservation and land resources
Subjects:Not in use, please see Agris categories
Agrovoc terms:lepidoptera, grasslands, biodiversity, habitats, farmland, landscape, land use, spatial distribution, planning, sweden
Keywords:butterflies, dispersal, landscape planning, land-use change, Lycaena virgaureae, Maniola jurtina, mark-release-recapture, spatial scale
URN:NBN:urn:nbn:se:slu:epsilon-33
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-33
ID Code:249
Department:?? 4050 ??
Deposited By: Christine Schneider
Deposited On:23 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:03

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